One of the original descriptions of arthroscopic autogenous osteochondral mosaicplasty. Small cylindrical grafts are harvested from the nonweightbearing patellofemoral periphery and transplanted into weightbearing femoral condyle defects. The report presents the technique with purpose-built instruments plus early outcomes in 44 patients compared against abrasion arthroplasty.
When you see a focal, full-thickness femoral condyle defect under 2 cm in a young active patient, mosaicplasty (later refined as OATS) restores actual hyaline cartilage rather than the fibrocartilage produced by microfracture or abrasion.
This matters because fibrocartilage is biomechanically inferior in weightbearing zones and does not reliably stop degeneration. The biopsy data here (type II collagen, preserved GAG, no interface gaps) is the histologic proof that distinguishes autograft transfer from marrow stimulation.
The practical decision rule: single-stage, no laboratory step, and it can be combined with ACL reconstruction or meniscal repair in the same sitting.
Remember the size boundaries. Larger defects outstrip donor supply and surface congruity, which is where allograft or autologous chondrocyte implantation enter the algorithm. This preliminary series set the stage for the prospective trials and long-term mosaicplasty data that followed.
One of the original descriptions of arthroscopic autogenous osteochondral mosaicplasty. Small cylindrical grafts are harvested from the nonweightbearing patellofemoral periphery and transplanted into weightbearing femoral condyle defects. The report presents the technique with purpose-built instruments plus early outcomes in 44 patients compared against abrasion arthroplasty.
When you see a focal, full-thickness femoral condyle defect under 2 cm in a young active patient, mosaicplasty (later refined as OATS) restores actual hyaline cartilage rather than the fibrocartilage produced by microfracture or abrasion.
This matters because fibrocartilage is biomechanically inferior in weightbearing zones and does not reliably stop degeneration. The biopsy data here (type II collagen, preserved GAG, no interface gaps) is the histologic proof that distinguishes autograft transfer from marrow stimulation.
The practical decision rule: single-stage, no laboratory step, and it can be combined with ACL reconstruction or meniscal repair in the same sitting.
Remember the size boundaries. Larger defects outstrip donor supply and surface congruity, which is where allograft or autologous chondrocyte implantation enter the algorithm. This preliminary series set the stage for the prospective trials and long-term mosaicplasty data that followed.